fs_api.c

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/*
     This file is part of GNUnet.
     Copyright (C) 2001--2012 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_fs_service.h"
#include "fs_api.h"
#include "fs_tree.h"

#define DEFAULT_MAX_PARALLEL_REQUESTS (1024 * 10)

#define DEFAULT_MAX_PARALLEL_DOWNLOADS 16

static void
start_job(struct GNUNET_FS_QueueEntry *qe)
{
  qe->active = GNUNET_YES;
  qe->start(qe->cls);
  qe->start_times++;
  qe->h->active_blocks += qe->blocks;
  qe->h->active_downloads++;
  qe->start_time = GNUNET_TIME_absolute_get();
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Starting job %p (%u active)\n",
             qe,
             qe->h->active_downloads);
  GNUNET_CONTAINER_DLL_remove(qe->h->pending_head, qe->h->pending_tail, qe);
  GNUNET_CONTAINER_DLL_insert_after(qe->h->running_head,
                                    qe->h->running_tail,
                                    qe->h->running_tail,
                                    qe);
}


static void
stop_job(struct GNUNET_FS_QueueEntry *qe)
{
  qe->active = GNUNET_NO;
  qe->stop(qe->cls);
  GNUNET_assert(0 < qe->h->active_downloads);
  qe->h->active_downloads--;
  qe->h->active_blocks -= qe->blocks;
  qe->run_time = GNUNET_TIME_relative_add(qe->run_time,
                                          GNUNET_TIME_absolute_get_duration(
                                            qe->start_time));
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Stopping job %p (%u active)\n",
             qe,
             qe->h->active_downloads);
  GNUNET_CONTAINER_DLL_remove(qe->h->running_head, qe->h->running_tail, qe);
  GNUNET_CONTAINER_DLL_insert_after(qe->h->pending_head,
                                    qe->h->pending_tail,
                                    qe->h->pending_tail,
                                    qe);
}


static void
process_job_queue(void *cls)
{
  struct GNUNET_FS_Handle *h = cls;
  struct GNUNET_FS_QueueEntry *qe;
  struct GNUNET_FS_QueueEntry *next;
  struct GNUNET_TIME_Relative run_time;
  struct GNUNET_TIME_Relative restart_at;
  struct GNUNET_TIME_Relative rst;
  struct GNUNET_TIME_Absolute end_time;
  unsigned int num_downloads_waiting;
  unsigned int num_downloads_active;
  unsigned int num_downloads_expired;
  unsigned int num_probes_active;
  unsigned int num_probes_waiting;
  unsigned int num_probes_expired;
  int num_probes_change;
  int num_downloads_change;
  int block_limit_hit;

  h->queue_job = NULL;
  /* restart_at will be set to the time when it makes sense to
     re-evaluate the job queue (unless, of course, jobs complete
     or are added, then we'll be triggered immediately */
  restart_at = GNUNET_TIME_UNIT_FOREVER_REL;
  /* first, calculate some basic statistics on pending jobs */
  num_probes_waiting = 0;
  num_downloads_waiting = 0;
  for (qe = h->pending_head; NULL != qe; qe = qe->next)
    {
      switch (qe->priority)
        {
        case GNUNET_FS_QUEUE_PRIORITY_PROBE:
          num_probes_waiting++;
          break;

        case GNUNET_FS_QUEUE_PRIORITY_NORMAL:
          num_downloads_waiting++;
          break;

        default:
          GNUNET_break(0);
          break;
        }
    }
  /* now, calculate some basic statistics on running jobs */
  num_probes_active = 0;
  num_probes_expired = 0;
  num_downloads_active = 0;
  num_downloads_expired = 0;
  next = h->running_head;
  while (NULL != (qe = next))
    {
      next = qe->next;
      switch (qe->priority)
        {
        case GNUNET_FS_QUEUE_PRIORITY_PROBE:
          run_time = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2);
          end_time = GNUNET_TIME_absolute_add(qe->start_time, run_time);
          rst = GNUNET_TIME_absolute_get_remaining(end_time);
          if (0 == rst.rel_value_us)
            {
              num_probes_expired++;
              stop_job(qe);
            }
          else
            {
              num_probes_active++;
              restart_at = GNUNET_TIME_relative_min(rst, restart_at);
            }
          break;

        case GNUNET_FS_QUEUE_PRIORITY_NORMAL:
          run_time =
            GNUNET_TIME_relative_saturating_multiply(h->avg_block_latency,
                                                     qe->blocks * qe->start_times);
          end_time = GNUNET_TIME_absolute_add(qe->start_time, run_time);
          rst = GNUNET_TIME_absolute_get_remaining(end_time);
          if (0 == rst.rel_value_us)
            {
              num_downloads_expired++;
              stop_job(qe);
            }
          else
            {
              num_downloads_active++;
              restart_at = GNUNET_TIME_relative_min(rst, restart_at);
            }
          break;

        default:
          GNUNET_break(0);
          break;
        }
    }
  GNUNET_break(h->active_downloads ==
               num_downloads_active + num_probes_active);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "PA: %u, PE: %u, PW: %u; DA: %u, DE: %u, DW: %u\n",
             num_probes_active,
             num_probes_expired,
             num_probes_waiting,
             num_downloads_active,
             num_downloads_expired,
             num_downloads_waiting);
  GNUNET_break(h->active_downloads + num_probes_active <=
               h->max_parallel_downloads);
  /* calculate start/stop decisions */
  if (h->active_downloads + num_downloads_waiting > h->max_parallel_downloads)
    {
      /* stop as many probes as there are downloads and probes */
      num_probes_change = -GNUNET_MIN(num_probes_active, num_downloads_waiting);
      /* start as many downloads as there are free slots, including those
         we just opened up */
      num_downloads_change =
        h->max_parallel_downloads - h->active_downloads - num_probes_change;
    }
  else
    {
      /* start all downloads (we can) */
      num_downloads_change = num_downloads_waiting;
      /* also start probes if there is room, but use a lower cap of (mpd/4) + 1 */
      if (1 + h->max_parallel_downloads / 4 >=
          (h->active_downloads + num_downloads_change))
        num_probes_change =
          GNUNET_MIN(num_probes_waiting,
                     (1 + h->max_parallel_downloads / 4) -
                     (h->active_downloads + num_downloads_change));
      else
        num_probes_change = 0;
    }
  GNUNET_break(num_downloads_change <= num_downloads_waiting);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Changing %d probes and %d/%u/%u downloads\n",
             num_probes_change,
             num_downloads_change,
             (unsigned int)h->active_downloads,
             (unsigned int)h->max_parallel_downloads);
  /* actually stop probes */
  next = h->running_head;
  while (NULL != (qe = next))
    {
      next = qe->next;
      if (GNUNET_FS_QUEUE_PRIORITY_PROBE != qe->priority)
        continue;
      if (num_probes_change < 0)
        {
          stop_job(qe);
          num_probes_change++;
          if (0 == num_probes_change)
            break;
        }
    }
  GNUNET_break(0 <= num_probes_change);

  /* start some more tasks if we now have empty slots */
  block_limit_hit = GNUNET_NO;
  next = h->pending_head;
  while ((NULL != (qe = next)) &&
         ((num_probes_change > 0) || (num_downloads_change > 0)))
    {
      next = qe->next;
      switch (qe->priority)
        {
        case GNUNET_FS_QUEUE_PRIORITY_PROBE:
          if (num_probes_change > 0)
            {
              start_job(qe);
              num_probes_change--;
              run_time = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2);
              restart_at = GNUNET_TIME_relative_min(run_time, restart_at);
            }
          break;

        case GNUNET_FS_QUEUE_PRIORITY_NORMAL:
          if ((num_downloads_change > 0) &&
              ((qe->blocks + h->active_blocks <= h->max_parallel_requests) ||
               ((qe->blocks > h->max_parallel_requests) &&
                (0 == h->active_downloads))))
            {
              start_job(qe);
              num_downloads_change--;
            }
          else if (num_downloads_change > 0)
            block_limit_hit = GNUNET_YES;
          break;

        default:
          GNUNET_break(0);
          break;
        }
    }
  GNUNET_break((0 == num_downloads_change) || (GNUNET_YES == block_limit_hit));
  GNUNET_break(0 == num_probes_change);

  GNUNET_log(
    GNUNET_ERROR_TYPE_DEBUG,
    "AD: %u, MP: %u; %d probes and %d downloads to start, will run again in %s\n",
    h->active_downloads,
    h->max_parallel_requests,
    num_probes_change,
    num_downloads_change,
    GNUNET_STRINGS_relative_time_to_string(restart_at, GNUNET_YES));

  /* make sure we run again, callbacks might have
     already re-scheduled the job, so cancel such
     an operation (if it exists) */
  if (NULL != h->queue_job)
    GNUNET_SCHEDULER_cancel(h->queue_job);
  h->queue_job =
    GNUNET_SCHEDULER_add_delayed(restart_at, &process_job_queue, h);
}


struct GNUNET_FS_QueueEntry *
GNUNET_FS_queue_(struct GNUNET_FS_Handle *h,
                 GNUNET_SCHEDULER_TaskCallback start,
                 GNUNET_SCHEDULER_TaskCallback stop,
                 void *cls,
                 unsigned int blocks,
                 enum GNUNET_FS_QueuePriority priority)
{
  struct GNUNET_FS_QueueEntry *qe;

  qe = GNUNET_new(struct GNUNET_FS_QueueEntry);
  qe->h = h;
  qe->start = start;
  qe->stop = stop;
  qe->cls = cls;
  qe->queue_time = GNUNET_TIME_absolute_get();
  qe->blocks = blocks;
  qe->priority = priority;
  GNUNET_CONTAINER_DLL_insert_after(h->pending_head,
                                    h->pending_tail,
                                    h->pending_tail,
                                    qe);
  if (NULL != h->queue_job)
    GNUNET_SCHEDULER_cancel(h->queue_job);
  h->queue_job = GNUNET_SCHEDULER_add_now(&process_job_queue, h);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Queueing job %p\n", qe);
  return qe;
}


void
GNUNET_FS_dequeue_(struct GNUNET_FS_QueueEntry *qe)
{
  struct GNUNET_FS_Handle *h;

  h = qe->h;
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Dequeueing job %p\n", qe);
  if (GNUNET_YES == qe->active)
    stop_job(qe);
  GNUNET_CONTAINER_DLL_remove(h->pending_head, h->pending_tail, qe);
  GNUNET_free(qe);
  if (NULL != h->queue_job)
    GNUNET_SCHEDULER_cancel(h->queue_job);
  h->queue_job = GNUNET_SCHEDULER_add_now(&process_job_queue, h);
}


struct TopLevelActivity *
GNUNET_FS_make_top(struct GNUNET_FS_Handle *h,
                   SuspendSignalFunction ssf,
                   void *ssf_cls)
{
  struct TopLevelActivity *ret;

  ret = GNUNET_new(struct TopLevelActivity);
  ret->ssf = ssf;
  ret->ssf_cls = ssf_cls;
  GNUNET_CONTAINER_DLL_insert(h->top_head, h->top_tail, ret);
  return ret;
}


void
GNUNET_FS_end_top(struct GNUNET_FS_Handle *h, struct TopLevelActivity *top)
{
  GNUNET_CONTAINER_DLL_remove(h->top_head, h->top_tail, top);
  GNUNET_free(top);
}


struct FileInfo {
  char *filename;

  struct GNUNET_DISK_FileHandle *fd;
};


size_t
GNUNET_FS_data_reader_file_(void *cls,
                            uint64_t offset,
                            size_t max,
                            void *buf,
                            char **emsg)
{
  struct FileInfo *fi = cls;
  ssize_t ret;

  if (UINT64_MAX == offset)
    {
      if (NULL != fi->fd)
        {
          GNUNET_DISK_file_close(fi->fd);
          fi->fd = NULL;
        }
      return 0;
    }
  if (0 == max)
    {
      if (NULL != fi->fd)
        GNUNET_DISK_file_close(fi->fd);
      GNUNET_free(fi->filename);
      GNUNET_free(fi);
      return 0;
    }
  if (NULL == fi->fd)
    {
      fi->fd = GNUNET_DISK_file_open(fi->filename,
                                     GNUNET_DISK_OPEN_READ,
                                     GNUNET_DISK_PERM_NONE);
      if (NULL == fi->fd)
        {
          GNUNET_asprintf(emsg,
                          _("Could not open file `%s': %s"),
                          fi->filename,
                          strerror(errno));
          return 0;
        }
    }
  if ((GNUNET_SYSERR ==
       GNUNET_DISK_file_seek(fi->fd, offset, GNUNET_DISK_SEEK_SET)) ||
      (-1 == (ret = GNUNET_DISK_file_read(fi->fd, buf, max))))
    {
      GNUNET_asprintf(emsg,
                      _("Could not read file `%s': %s"),
                      fi->filename,
                      strerror(errno));
      return 0;
    }
  if (ret != max)
    {
      GNUNET_asprintf(emsg,
                      _("Short read reading from file `%s'!"),
                      fi->filename);
      return 0;
    }
  return max;
}


void *
GNUNET_FS_make_file_reader_context_(const char *filename)
{
  struct FileInfo *fi;

  fi = GNUNET_new(struct FileInfo);
  fi->filename = GNUNET_STRINGS_filename_expand(filename);
  if (NULL == fi->filename)
    {
      GNUNET_free(fi);
      return NULL;
    }
  return fi;
}


size_t
GNUNET_FS_data_reader_copy_(void *cls,
                            uint64_t offset,
                            size_t max,
                            void *buf,
                            char **emsg)
{
  char *data = cls;

  if (UINT64_MAX == offset)
    return 0;
  if (0 == max)
    {
      GNUNET_free_non_null(data);
      return 0;
    }
  GNUNET_memcpy(buf, &data[offset], max);
  return max;
}


static char *
get_serialization_file_name(struct GNUNET_FS_Handle *h,
                            const char *ext,
                            const char *ent)
{
  char *basename;
  char *ret;

  if (0 == (h->flags & GNUNET_FS_FLAGS_PERSISTENCE))
    return NULL; /* persistence not requested */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename(h->cfg,
                                                           "fs",
                                                           "STATE_DIR",
                                                           &basename))
    return NULL;
  GNUNET_asprintf(&ret,
                  "%s%s%s%s%s%s%s",
                  basename,
                  DIR_SEPARATOR_STR,
                  h->client_name,
                  DIR_SEPARATOR_STR,
                  ext,
                  DIR_SEPARATOR_STR,
                  ent);
  GNUNET_free(basename);
  return ret;
}


static char *
get_serialization_file_name_in_dir(struct GNUNET_FS_Handle *h,
                                   const char *ext,
                                   const char *uni,
                                   const char *ent)
{
  char *basename;
  char *ret;

  if (0 == (h->flags & GNUNET_FS_FLAGS_PERSISTENCE))
    return NULL; /* persistence not requested */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename(h->cfg,
                                                           "fs",
                                                           "STATE_DIR",
                                                           &basename))
    return NULL;
  GNUNET_asprintf(&ret,
                  "%s%s%s%s%s%s%s.dir%s%s",
                  basename,
                  DIR_SEPARATOR_STR,
                  h->client_name,
                  DIR_SEPARATOR_STR,
                  ext,
                  DIR_SEPARATOR_STR,
                  uni,
                  DIR_SEPARATOR_STR,
                  ent);
  GNUNET_free(basename);
  return ret;
}


static struct GNUNET_BIO_ReadHandle *
get_read_handle(struct GNUNET_FS_Handle *h, const char *ext, const char *ent)
{
  char *fn;
  struct GNUNET_BIO_ReadHandle *ret;

  fn = get_serialization_file_name(h, ext, ent);
  if (NULL == fn)
    return NULL;
  ret = GNUNET_BIO_read_open(fn);
  GNUNET_free(fn);
  return ret;
}


static struct GNUNET_BIO_WriteHandle *
get_write_handle(struct GNUNET_FS_Handle *h, const char *ext, const char *ent)
{
  char *fn;
  struct GNUNET_BIO_WriteHandle *ret;

  fn = get_serialization_file_name(h, ext, ent);
  if (NULL == fn)
    return NULL;
  ret = GNUNET_BIO_write_open(fn);
  GNUNET_break(NULL != ret);
  GNUNET_free(fn);
  return ret;
}


static struct GNUNET_BIO_WriteHandle *
get_write_handle_in_dir(struct GNUNET_FS_Handle *h,
                        const char *ext,
                        const char *uni,
                        const char *ent)
{
  char *fn;
  struct GNUNET_BIO_WriteHandle *ret;

  fn = get_serialization_file_name_in_dir(h, ext, uni, ent);
  if (NULL == fn)
    return NULL;
  ret = GNUNET_BIO_write_open(fn);
  GNUNET_free(fn);
  return ret;
}


void
GNUNET_FS_remove_sync_file_(struct GNUNET_FS_Handle *h,
                            const char *ext,
                            const char *ent)
{
  char *filename;

  if ((NULL == ent) || (0 == strlen(ent)))
    {
      GNUNET_break(0);
      return;
    }
  filename = get_serialization_file_name(h, ext, ent);
  if (NULL != filename)
    {
      if ((0 != unlink(filename)) && (ENOENT != errno))
        GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
      GNUNET_free(filename);
    }
}


static void
remove_sync_file_in_dir(struct GNUNET_FS_Handle *h,
                        const char *ext,
                        const char *uni,
                        const char *ent)
{
  char *filename;

  if ((NULL == ent) || (0 == strlen(ent)))
    {
      GNUNET_break(0);
      return;
    }
  filename = get_serialization_file_name_in_dir(h, ext, uni, ent);
  if (NULL == filename)
    return;
  if (0 != unlink(filename))
    GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
  GNUNET_free(filename);
}


void
GNUNET_FS_remove_sync_dir_(struct GNUNET_FS_Handle *h,
                           const char *ext,
                           const char *uni)
{
  char *dn;

  if (NULL == uni)
    return;
  dn = get_serialization_file_name_in_dir(h, ext, uni, "");
  if (NULL == dn)
    return;
  if ((GNUNET_YES == GNUNET_DISK_directory_test(dn, GNUNET_YES)) &&
      (GNUNET_OK != GNUNET_DISK_directory_remove(dn)))
    GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "rmdir", dn);
  GNUNET_free(dn);
}


static int
write_start_time(struct GNUNET_BIO_WriteHandle *wh,
                 struct GNUNET_TIME_Absolute timestamp)
{
  struct GNUNET_TIME_Relative dur;

  dur = GNUNET_TIME_absolute_get_duration(timestamp);
  return GNUNET_BIO_write_int64(wh, dur.rel_value_us);
}


static int
read_start_time(struct GNUNET_BIO_ReadHandle *rh,
                struct GNUNET_TIME_Absolute *timestamp)
{
  struct GNUNET_TIME_Relative dur;

  if (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dur.rel_value_us))
    return GNUNET_SYSERR;
  *timestamp = GNUNET_TIME_absolute_subtract(GNUNET_TIME_absolute_get(), dur);
  return GNUNET_OK;
}


static struct GNUNET_FS_FileInformation *
deserialize_file_information(struct GNUNET_FS_Handle *h, const char *filename);


static struct GNUNET_FS_FileInformation *
deserialize_fi_node(struct GNUNET_FS_Handle *h,
                    const char *fn,
                    struct GNUNET_BIO_ReadHandle *rh)
{
  struct GNUNET_FS_FileInformation *ret;
  struct GNUNET_FS_FileInformation *nxt;
  char b;
  char *ksks;
  char *chks;
  char *skss;
  char *filename;
  uint32_t dsize;

  if (GNUNET_OK != GNUNET_BIO_read(rh, "status flag", &b, sizeof(b)))
    {
      GNUNET_break(0);
      return NULL;
    }
  ret = GNUNET_new(struct GNUNET_FS_FileInformation);
  ret->h = h;
  ksks = NULL;
  chks = NULL;
  skss = NULL;
  filename = NULL;
  if ((GNUNET_OK != GNUNET_BIO_read_meta_data(rh, "metadata", &ret->meta)) ||
      (GNUNET_OK != GNUNET_BIO_read_string(rh, "ksk-uri", &ksks, 32 * 1024)) ||
      ((NULL != ksks) &&
       ((NULL == (ret->keywords = GNUNET_FS_uri_parse(ksks, NULL))) ||
        (GNUNET_YES != GNUNET_FS_uri_test_ksk(ret->keywords)))) ||
      (GNUNET_OK != GNUNET_BIO_read_string(rh, "chk-uri", &chks, 1024)) ||
      ((NULL != chks) &&
       ((NULL == (ret->chk_uri = GNUNET_FS_uri_parse(chks, NULL))) ||
        (GNUNET_YES != GNUNET_FS_uri_test_chk(ret->chk_uri)))) ||
      (GNUNET_OK != GNUNET_BIO_read_string(rh, "sks-uri", &skss, 1024)) ||
      ((NULL != skss) &&
       ((NULL == (ret->sks_uri = GNUNET_FS_uri_parse(skss, NULL))) ||
        (GNUNET_YES != GNUNET_FS_uri_test_sks(ret->sks_uri)))) ||
      (GNUNET_OK != read_start_time(rh, &ret->start_time)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "emsg", &ret->emsg, 16 * 1024)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "fn", &ret->filename, 16 * 1024)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_int64(rh, &ret->bo.expiration_time.abs_value_us)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &ret->bo.anonymity_level)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &ret->bo.content_priority)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &ret->bo.replication_level)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  switch (b)
    {
    case 0: /* file-insert */
      if (GNUNET_OK != GNUNET_BIO_read_int64(rh, &ret->data.file.file_size))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      ret->is_directory = GNUNET_NO;
      ret->data.file.do_index = GNUNET_NO;
      ret->data.file.have_hash = GNUNET_NO;
      ret->data.file.index_start_confirmed = GNUNET_NO;
      if (GNUNET_NO == ret->is_published)
        {
          if (NULL == ret->filename)
            {
              ret->data.file.reader = &GNUNET_FS_data_reader_copy_;
              ret->data.file.reader_cls =
                GNUNET_malloc_large(ret->data.file.file_size);
              if (ret->data.file.reader_cls == NULL)
                goto cleanup;
              if (GNUNET_OK != GNUNET_BIO_read(rh,
                                               "file-data",
                                               ret->data.file.reader_cls,
                                               ret->data.file.file_size))
                {
                  GNUNET_break(0);
                  goto cleanup;
                }
            }
          else
            {
              ret->data.file.reader = &GNUNET_FS_data_reader_file_;
              ret->data.file.reader_cls =
                GNUNET_FS_make_file_reader_context_(ret->filename);
            }
        }
      break;

    case 1: /* file-index, no hash */
      if (NULL == ret->filename)
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if (GNUNET_OK != GNUNET_BIO_read_int64(rh, &ret->data.file.file_size))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      ret->is_directory = GNUNET_NO;
      ret->data.file.do_index = GNUNET_YES;
      ret->data.file.have_hash = GNUNET_NO;
      ret->data.file.index_start_confirmed = GNUNET_NO;
      ret->data.file.reader = &GNUNET_FS_data_reader_file_;
      ret->data.file.reader_cls =
        GNUNET_FS_make_file_reader_context_(ret->filename);
      break;

    case 2: /* file-index-with-hash */
      if (NULL == ret->filename)
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if ((GNUNET_OK != GNUNET_BIO_read_int64(rh, &ret->data.file.file_size)) ||
          (GNUNET_OK != GNUNET_BIO_read(rh,
                                        "fileid",
                                        &ret->data.file.file_id,
                                        sizeof(struct GNUNET_HashCode))))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      ret->is_directory = GNUNET_NO;
      ret->data.file.do_index = GNUNET_YES;
      ret->data.file.have_hash = GNUNET_YES;
      ret->data.file.index_start_confirmed = GNUNET_NO;
      ret->data.file.reader = &GNUNET_FS_data_reader_file_;
      ret->data.file.reader_cls =
        GNUNET_FS_make_file_reader_context_(ret->filename);
      break;

    case 3: /* file-index-with-hash-confirmed */
      if (NULL == ret->filename)
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if ((GNUNET_OK != GNUNET_BIO_read_int64(rh, &ret->data.file.file_size)) ||
          (GNUNET_OK != GNUNET_BIO_read(rh,
                                        "fileid",
                                        &ret->data.file.file_id,
                                        sizeof(struct GNUNET_HashCode))))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      ret->is_directory = GNUNET_NO;
      ret->data.file.do_index = GNUNET_YES;
      ret->data.file.have_hash = GNUNET_YES;
      ret->data.file.index_start_confirmed = GNUNET_YES;
      ret->data.file.reader = &GNUNET_FS_data_reader_file_;
      ret->data.file.reader_cls =
        GNUNET_FS_make_file_reader_context_(ret->filename);
      break;

    case 4: /* directory */
      ret->is_directory = GNUNET_YES;
      if ((GNUNET_OK != GNUNET_BIO_read_int32(rh, &dsize)) ||
          (GNUNET_OK !=
           GNUNET_BIO_read_int64(rh, &ret->data.dir.contents_completed)) ||
          (GNUNET_OK !=
           GNUNET_BIO_read_int64(rh, &ret->data.dir.contents_size)) ||
          (NULL == (ret->data.dir.dir_data = GNUNET_malloc_large(dsize))) ||
          (GNUNET_OK !=
           GNUNET_BIO_read(rh, "dir-data", ret->data.dir.dir_data, dsize)) ||
          (GNUNET_OK !=
           GNUNET_BIO_read_string(rh, "ent-filename", &filename, 16 * 1024)))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      ret->data.dir.dir_size = (uint32_t)dsize;
      if (NULL != filename)
        {
          ret->data.dir.entries = deserialize_file_information(h, filename);
          GNUNET_free(filename);
          filename = NULL;
          nxt = ret->data.dir.entries;
          while (NULL != nxt)
            {
              nxt->dir = ret;
              nxt = nxt->next;
            }
        }
      break;

    default:
      GNUNET_break(0);
      goto cleanup;
    }
  ret->serialization = GNUNET_strdup(fn);
  if (GNUNET_OK !=
      GNUNET_BIO_read_string(rh, "nxt-filename", &filename, 16 * 1024))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (NULL != filename)
    {
      ret->next = deserialize_file_information(h, filename);
      GNUNET_free(filename);
      filename = NULL;
    }
  GNUNET_free_non_null(ksks);
  GNUNET_free_non_null(skss);
  GNUNET_free_non_null(chks);
  return ret;
cleanup:
  GNUNET_free_non_null(ksks);
  GNUNET_free_non_null(chks);
  GNUNET_free_non_null(skss);
  GNUNET_free_non_null(filename);
  GNUNET_FS_file_information_destroy(ret, NULL, NULL);
  return NULL;
}


static struct GNUNET_FS_FileInformation *
deserialize_file_information(struct GNUNET_FS_Handle *h, const char *filename)
{
  struct GNUNET_FS_FileInformation *ret;
  struct GNUNET_BIO_ReadHandle *rh;
  char *emsg;
  char *fn;

  rh = get_read_handle(h, GNUNET_FS_SYNC_PATH_FILE_INFO, filename);
  if (NULL == rh)
    return NULL;
  ret = deserialize_fi_node(h, filename, rh);
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failed to resume publishing information `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  if (NULL == ret)
    {
      fn =
        get_serialization_file_name(h, GNUNET_FS_SYNC_PATH_FILE_INFO, filename);
      if (NULL != fn)
        {
          if (0 != unlink(fn))
            GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", fn);
          GNUNET_free(fn);
        }
    }
  return ret;
}


static char *
get_serialization_short_name(const char *fullname)
{
  const char *end;
  const char *nxt;

  end = NULL;
  nxt = fullname;
  /* FIXME: we could do this faster since we know
   * the length of 'end'... */
  while ('\0' != *nxt)
    {
      if (DIR_SEPARATOR == *nxt)
        end = nxt + 1;
      nxt++;
    }
  if ((NULL == end) || (0 == strlen(end)))
    {
      GNUNET_break(0);
      return NULL;
    }
  GNUNET_break(6 == strlen(end));
  return GNUNET_strdup(end);
}


static char *
make_serialization_file_name(struct GNUNET_FS_Handle *h, const char *ext)
{
  char *fn;
  char *dn;
  char *ret;

  if (0 == (h->flags & GNUNET_FS_FLAGS_PERSISTENCE))
    return NULL; /* persistence not requested */
  dn = get_serialization_file_name(h, ext, "");
  if (NULL == dn)
    return NULL;
  if (GNUNET_OK != GNUNET_DISK_directory_create_for_file(dn))
    {
      GNUNET_free(dn);
      return NULL;
    }
  fn = GNUNET_DISK_mktemp(dn);
  GNUNET_free(dn);
  if (NULL == fn)
    return NULL; /* epic fail */
  ret = get_serialization_short_name(fn);
  GNUNET_free(fn);
  return ret;
}


static char *
make_serialization_file_name_in_dir(struct GNUNET_FS_Handle *h,
                                    const char *ext,
                                    const char *uni)
{
  char *fn;
  char *dn;
  char *ret;

  if (0 == (h->flags & GNUNET_FS_FLAGS_PERSISTENCE))
    return NULL; /* persistence not requested */
  dn = get_serialization_file_name_in_dir(h, ext, uni, "");
  if (NULL == dn)
    return NULL;
  if (GNUNET_OK != GNUNET_DISK_directory_create_for_file(dn))
    {
      GNUNET_free(dn);
      return NULL;
    }
  fn = GNUNET_DISK_mktemp(dn);
  GNUNET_free(dn);
  if (NULL == fn)
    return NULL; /* epic fail */
  ret = get_serialization_short_name(fn);
  GNUNET_free(fn);
  return ret;
}


static int
copy_from_reader(struct GNUNET_BIO_WriteHandle *wh,
                 struct GNUNET_FS_FileInformation *fi)
{
  char buf[32 * 1024];
  uint64_t off;
  size_t ret;
  size_t left;
  char *emsg;

  emsg = NULL;
  off = 0;
  while (off < fi->data.file.file_size)
    {
      left = GNUNET_MIN(sizeof(buf), fi->data.file.file_size - off);
      ret =
        fi->data.file.reader(fi->data.file.reader_cls, off, left, buf, &emsg);
      if (0 == ret)
        {
          GNUNET_free(emsg);
          return GNUNET_SYSERR;
        }
      if (GNUNET_OK != GNUNET_BIO_write(wh, buf, ret))
        return GNUNET_SYSERR;
      off += ret;
    }
  return GNUNET_OK;
}


void
GNUNET_FS_file_information_sync_(struct GNUNET_FS_FileInformation *fi)
{
  char *fn;
  struct GNUNET_BIO_WriteHandle *wh;
  char b;
  char *ksks;
  char *chks;
  char *skss;

  if (NULL == fi->serialization)
    fi->serialization =
      make_serialization_file_name(fi->h, GNUNET_FS_SYNC_PATH_FILE_INFO);
  if (NULL == fi->serialization)
    return;
  wh =
    get_write_handle(fi->h, GNUNET_FS_SYNC_PATH_FILE_INFO, fi->serialization);
  if (NULL == wh)
    {
      GNUNET_free(fi->serialization);
      fi->serialization = NULL;
      return;
    }
  if (GNUNET_YES == fi->is_directory)
    b = 4;
  else if (GNUNET_YES == fi->data.file.index_start_confirmed)
    b = 3;
  else if (GNUNET_YES == fi->data.file.have_hash)
    b = 2;
  else if (GNUNET_YES == fi->data.file.do_index)
    b = 1;
  else
    b = 0;
  if (NULL != fi->keywords)
    ksks = GNUNET_FS_uri_to_string(fi->keywords);
  else
    ksks = NULL;
  if (NULL != fi->chk_uri)
    chks = GNUNET_FS_uri_to_string(fi->chk_uri);
  else
    chks = NULL;
  if (NULL != fi->sks_uri)
    skss = GNUNET_FS_uri_to_string(fi->sks_uri);
  else
    skss = NULL;
  if ((GNUNET_OK != GNUNET_BIO_write(wh, &b, sizeof(b))) ||
      (GNUNET_OK != GNUNET_BIO_write_meta_data(wh, fi->meta)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, ksks)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, chks)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, skss)) ||
      (GNUNET_OK != write_start_time(wh, fi->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, fi->emsg)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, fi->filename)) ||
      (GNUNET_OK !=
       GNUNET_BIO_write_int64(wh, fi->bo.expiration_time.abs_value_us)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, fi->bo.anonymity_level)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, fi->bo.content_priority)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, fi->bo.replication_level)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  GNUNET_free_non_null(chks);
  chks = NULL;
  GNUNET_free_non_null(ksks);
  ksks = NULL;
  GNUNET_free_non_null(skss);
  skss = NULL;

  switch (b)
    {
    case 0: /* file-insert */
      if (GNUNET_OK != GNUNET_BIO_write_int64(wh, fi->data.file.file_size))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if ((GNUNET_NO == fi->is_published) && (NULL == fi->filename))
        if (GNUNET_OK != copy_from_reader(wh, fi))
          {
            GNUNET_break(0);
            goto cleanup;
          }
      break;

    case 1: /* file-index, no hash */
      if (NULL == fi->filename)
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if (GNUNET_OK != GNUNET_BIO_write_int64(wh, fi->data.file.file_size))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      break;

    case 2: /* file-index-with-hash */
    case 3: /* file-index-with-hash-confirmed */
      if (NULL == fi->filename)
        {
          GNUNET_break(0);
          goto cleanup;
        }
      if ((GNUNET_OK != GNUNET_BIO_write_int64(wh, fi->data.file.file_size)) ||
          (GNUNET_OK != GNUNET_BIO_write(wh,
                                         &fi->data.file.file_id,
                                         sizeof(struct GNUNET_HashCode))))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      break;

    case 4: /* directory */
      if ((NULL != fi->data.dir.entries) &&
          (NULL == fi->data.dir.entries->serialization))
        GNUNET_FS_file_information_sync_(fi->data.dir.entries);
      if ((GNUNET_OK != GNUNET_BIO_write_int32(wh, fi->data.dir.dir_size)) ||
          (GNUNET_OK !=
           GNUNET_BIO_write_int64(wh, fi->data.dir.contents_completed)) ||
          (GNUNET_OK !=
           GNUNET_BIO_write_int64(wh, fi->data.dir.contents_size)) ||
          (GNUNET_OK != GNUNET_BIO_write(wh,
                                         fi->data.dir.dir_data,
                                         (uint32_t)fi->data.dir.dir_size)) ||
          (GNUNET_OK !=
           GNUNET_BIO_write_string(wh,
                                   (fi->data.dir.entries == NULL)
                                   ? NULL
                                   : fi->data.dir.entries->serialization)))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      break;

    default:
      GNUNET_assert(0);
      goto cleanup;
    }
  if ((NULL != fi->next) && (NULL == fi->next->serialization))
    GNUNET_FS_file_information_sync_(fi->next);
  if (GNUNET_OK != GNUNET_BIO_write_string(wh,
                                           (fi->next != NULL)
                                           ? fi->next->serialization
                                           : NULL))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  return; /* done! */
cleanup:
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  GNUNET_free_non_null(chks);
  GNUNET_free_non_null(ksks);
  GNUNET_free_non_null(skss);
  fn = get_serialization_file_name(fi->h,
                                   GNUNET_FS_SYNC_PATH_FILE_INFO,
                                   fi->serialization);
  if (NULL != fn)
    {
      if (0 != unlink(fn))
        GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", fn);
      GNUNET_free(fn);
    }
  GNUNET_free(fi->serialization);
  fi->serialization = NULL;
}


static struct GNUNET_FS_FileInformation *
find_file_position(struct GNUNET_FS_FileInformation *pos, const char *srch)
{
  struct GNUNET_FS_FileInformation *r;

  while (NULL != pos)
    {
      if (0 == strcmp(srch, pos->serialization))
        return pos;
      if ((GNUNET_YES == pos->is_directory) &&
          (NULL != (r = find_file_position(pos->data.dir.entries, srch))))
        return r;
      pos = pos->next;
    }
  return NULL;
}


static int
fip_signal_resume(void *cls,
                  struct GNUNET_FS_FileInformation *fi,
                  uint64_t length,
                  struct GNUNET_CONTAINER_MetaData *meta,
                  struct GNUNET_FS_Uri **uri,
                  struct GNUNET_FS_BlockOptions *bo,
                  int *do_index,
                  void **client_info)
{
  struct GNUNET_FS_PublishContext *pc = cls;
  struct GNUNET_FS_ProgressInfo pi;

  if (GNUNET_YES == pc->skip_next_fi_callback)
    {
      pc->skip_next_fi_callback = GNUNET_NO;
      return GNUNET_OK;
    }
  pi.status = GNUNET_FS_STATUS_PUBLISH_RESUME;
  pi.value.publish.specifics.resume.message = fi->emsg;
  pi.value.publish.specifics.resume.chk_uri = fi->chk_uri;
  *client_info = GNUNET_FS_publish_make_status_(&pi, pc, fi, 0);
  if (GNUNET_YES == GNUNET_FS_meta_data_test_for_directory(meta))
    {
      /* process entries in directory */
      pc->skip_next_fi_callback = GNUNET_YES;
      GNUNET_FS_file_information_inspect(fi, &fip_signal_resume, pc);
    }
  return GNUNET_OK;
}


static int
deserialize_publish_file(void *cls, const char *filename)
{
  struct GNUNET_FS_Handle *h = cls;
  struct GNUNET_BIO_ReadHandle *rh;
  struct GNUNET_FS_PublishContext *pc;
  int32_t options;
  int32_t all_done;
  int32_t have_ns;
  char *fi_root;
  struct GNUNET_CRYPTO_EcdsaPrivateKey ns;
  char *fi_pos;
  char *emsg;

  pc = GNUNET_new(struct GNUNET_FS_PublishContext);
  pc->h = h;
  pc->serialization = get_serialization_short_name(filename);
  fi_root = NULL;
  fi_pos = NULL;
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if ((GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "publish-nid", &pc->nid, 1024)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "publish-nuid", &pc->nuid, 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &options)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &all_done)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &have_ns)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "publish-firoot", &fi_root, 128)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "publish-fipos", &fi_pos, 128)) ||
      ((GNUNET_YES == have_ns) &&
       (GNUNET_OK != GNUNET_BIO_read(rh, "publish-ns", &ns, sizeof(ns)))))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  pc->options = options;
  pc->all_done = all_done;
  if (NULL == fi_root)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  pc->fi = deserialize_file_information(h, fi_root);
  if (NULL == pc->fi)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_YES == have_ns)
    {
      pc->ns = GNUNET_new(struct GNUNET_CRYPTO_EcdsaPrivateKey);
      *pc->ns = ns;
    }
  if ((0 == (pc->options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY)) &&
      (GNUNET_YES != pc->all_done))
    {
      pc->dsh = GNUNET_DATASTORE_connect(h->cfg);
      if (NULL == pc->dsh)
        goto cleanup;
    }
  if (NULL != fi_pos)
    {
      pc->fi_pos = find_file_position(pc->fi, fi_pos);
      GNUNET_free(fi_pos);
      fi_pos = NULL;
      if (NULL == pc->fi_pos)
        {
          /* failed to find position for resuming, outch! Will start from root! */
          GNUNET_break(0);
          if (GNUNET_YES != pc->all_done)
            pc->fi_pos = pc->fi;
        }
    }
  GNUNET_free(fi_root);
  fi_root = NULL;
  /* generate RESUME event(s) */
  GNUNET_FS_file_information_inspect(pc->fi, &fip_signal_resume, pc);

  /* re-start publishing (if needed)... */
  if (GNUNET_YES != pc->all_done)
    {
      GNUNET_assert(NULL == pc->upload_task);
      pc->upload_task =
        GNUNET_SCHEDULER_add_with_priority(GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
                                           &GNUNET_FS_publish_main_,
                                           pc);
    }
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming publishing operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  pc->top = GNUNET_FS_make_top(h, &GNUNET_FS_publish_signal_suspend_, pc);
  return GNUNET_OK;
cleanup:
  GNUNET_free_non_null(pc->nid);
  GNUNET_free_non_null(pc->nuid);
  GNUNET_free_non_null(fi_root);
  GNUNET_free_non_null(fi_pos);
  if ((NULL != rh) && (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg)))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failed to resume publishing operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  if (NULL != pc->fi)
    GNUNET_FS_file_information_destroy(pc->fi, NULL, NULL);
  if (0 != unlink(filename))
    GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
  GNUNET_free(pc->serialization);
  GNUNET_free(pc);
  return GNUNET_OK;
}


void
GNUNET_FS_publish_sync_(struct GNUNET_FS_PublishContext *pc)
{
  struct GNUNET_BIO_WriteHandle *wh;
  int32_t have_ns;

  if (NULL == pc->serialization)
    pc->serialization =
      make_serialization_file_name(pc->h, GNUNET_FS_SYNC_PATH_MASTER_PUBLISH);
  if (NULL == pc->serialization)
    return;
  if (NULL == pc->fi)
    return;
  if (NULL == pc->fi->serialization)
    {
      GNUNET_break(0);
      return;
    }
  wh = get_write_handle(pc->h,
                        GNUNET_FS_SYNC_PATH_MASTER_PUBLISH,
                        pc->serialization);
  if (NULL == wh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  have_ns = (NULL != pc->ns) ? GNUNET_YES : GNUNET_NO;
  if ((GNUNET_OK != GNUNET_BIO_write_string(wh, pc->nid)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, pc->nuid)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, pc->options)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, pc->all_done)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, have_ns)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, pc->fi->serialization)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh,
                                            (NULL == pc->fi_pos)
                                            ? NULL
                                            : pc->fi_pos->serialization)) ||
      ((NULL != pc->ns) &&
       (GNUNET_OK !=
        GNUNET_BIO_write(wh,
                         pc->ns,
                         sizeof(struct GNUNET_CRYPTO_EcdsaPrivateKey)))))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  return;
cleanup:
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  GNUNET_FS_remove_sync_file_(pc->h,
                              GNUNET_FS_SYNC_PATH_MASTER_PUBLISH,
                              pc->serialization);
  GNUNET_free(pc->serialization);
  pc->serialization = NULL;
}


void
GNUNET_FS_unindex_sync_(struct GNUNET_FS_UnindexContext *uc)
{
  struct GNUNET_BIO_WriteHandle *wh;
  char *uris;

  if (NULL == uc->serialization)
    uc->serialization =
      make_serialization_file_name(uc->h, GNUNET_FS_SYNC_PATH_MASTER_UNINDEX);
  if (NULL == uc->serialization)
    return;
  wh = get_write_handle(uc->h,
                        GNUNET_FS_SYNC_PATH_MASTER_UNINDEX,
                        uc->serialization);
  if (NULL == wh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (NULL != uc->ksk_uri)
    uris = GNUNET_FS_uri_to_string(uc->ksk_uri);
  else
    uris = NULL;
  if ((GNUNET_OK != GNUNET_BIO_write_string(wh, uc->filename)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, uc->file_size)) ||
      (GNUNET_OK != write_start_time(wh, uc->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, (uint32_t)uc->state)) ||
      (GNUNET_OK !=
       GNUNET_BIO_write(wh, &uc->chk, sizeof(struct ContentHashKey))) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, uris)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, (uint32_t)uc->ksk_offset)) ||
      ((uc->state == UNINDEX_STATE_FS_NOTIFY) &&
       (GNUNET_OK != GNUNET_BIO_write(wh,
                                      &uc->file_id,
                                      sizeof(struct GNUNET_HashCode)))) ||
      ((uc->state == UNINDEX_STATE_ERROR) &&
       (GNUNET_OK != GNUNET_BIO_write_string(wh, uc->emsg))))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  return;
cleanup:
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  GNUNET_FS_remove_sync_file_(uc->h,
                              GNUNET_FS_SYNC_PATH_MASTER_UNINDEX,
                              uc->serialization);
  GNUNET_free(uc->serialization);
  uc->serialization = NULL;
}


static int
write_download_request(struct GNUNET_BIO_WriteHandle *wh,
                       struct DownloadRequest *dr)
{
  unsigned int i;

  if ((GNUNET_OK != GNUNET_BIO_write_int32(wh, dr->state)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, dr->offset)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, dr->num_children)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, dr->depth)))
    return GNUNET_NO;
  if ((BRS_CHK_SET == dr->state) &&
      (GNUNET_OK !=
       GNUNET_BIO_write(wh, &dr->chk, sizeof(struct ContentHashKey))))
    return GNUNET_NO;
  for (i = 0; i < dr->num_children; i++)
    if (GNUNET_NO == write_download_request(wh, dr->children[i]))
      return GNUNET_NO;
  return GNUNET_YES;
}


static struct DownloadRequest *
read_download_request(struct GNUNET_BIO_ReadHandle *rh)
{
  struct DownloadRequest *dr;
  unsigned int i;

  dr = GNUNET_new(struct DownloadRequest);
  if ((GNUNET_OK != GNUNET_BIO_read_int32(rh, &dr->state)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dr->offset)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &dr->num_children)) ||
      (dr->num_children > CHK_PER_INODE) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &dr->depth)) ||
      ((0 == dr->depth) && (dr->num_children > 0)) ||
      ((dr->depth > 0) && (0 == dr->num_children)))
    {
      GNUNET_break(0);
      dr->num_children = 0;
      goto cleanup;
    }
  if (dr->num_children > 0)
    dr->children =
      GNUNET_malloc(dr->num_children * sizeof(struct DownloadRequest *));
  switch (dr->state)
    {
    case BRS_INIT:
    case BRS_RECONSTRUCT_DOWN:
    case BRS_RECONSTRUCT_META_UP:
    case BRS_RECONSTRUCT_UP:
      break;

    case BRS_CHK_SET:
      if (GNUNET_OK !=
          GNUNET_BIO_read(rh, "chk", &dr->chk, sizeof(struct ContentHashKey)))
        goto cleanup;
      break;

    case BRS_DOWNLOAD_DOWN:
    case BRS_DOWNLOAD_UP:
    case BRS_ERROR:
      break;

    default:
      GNUNET_break(0);
      goto cleanup;
    }
  for (i = 0; i < dr->num_children; i++)
    {
      if (NULL == (dr->children[i] = read_download_request(rh)))
        goto cleanup;
      dr->children[i]->parent = dr;
    }
  return dr;
cleanup:
  GNUNET_FS_free_download_request_(dr);
  return NULL;
}


static char *
get_download_sync_filename(struct GNUNET_FS_DownloadContext *dc,
                           const char *uni,
                           const char *ext)
{
  char *par;
  char *epar;

  if (dc->parent == NULL)
    return get_serialization_file_name(dc->h,
                                       (dc->search != NULL)
                                       ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD
                                       : GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
                                       uni);
  if (NULL == dc->parent->serialization)
    return NULL;
  par = get_download_sync_filename(dc->parent, dc->parent->serialization, "");
  if (NULL == par)
    return NULL;
  GNUNET_asprintf(&epar, "%s.dir%s%s%s", par, DIR_SEPARATOR_STR, uni, ext);
  GNUNET_free(par);
  return epar;
}


void
GNUNET_FS_download_sync_(struct GNUNET_FS_DownloadContext *dc)
{
  struct GNUNET_BIO_WriteHandle *wh;
  char *uris;
  char *fn;
  char *dir;

  if (0 != (dc->options & GNUNET_FS_DOWNLOAD_IS_PROBE))
    return; /* we don't sync probes */
  if (NULL == dc->serialization)
    {
      dir = get_download_sync_filename(dc, "", "");
      if (NULL == dir)
        return;
      if (GNUNET_OK != GNUNET_DISK_directory_create_for_file(dir))
        {
          GNUNET_free(dir);
          return;
        }
      fn = GNUNET_DISK_mktemp(dir);
      GNUNET_free(dir);
      if (NULL == fn)
        return;
      dc->serialization = get_serialization_short_name(fn);
    }
  else
    {
      fn = get_download_sync_filename(dc, dc->serialization, "");
      if (NULL == fn)
        {
          GNUNET_free(dc->serialization);
          dc->serialization = NULL;
          GNUNET_free(fn);
          return;
        }
    }
  wh = GNUNET_BIO_write_open(fn);
  if (NULL == wh)
    {
      GNUNET_free(dc->serialization);
      dc->serialization = NULL;
      GNUNET_free(fn);
      return;
    }
  GNUNET_assert((GNUNET_YES == GNUNET_FS_uri_test_chk(dc->uri)) ||
                (GNUNET_YES == GNUNET_FS_uri_test_loc(dc->uri)));
  uris = GNUNET_FS_uri_to_string(dc->uri);
  if ((GNUNET_OK != GNUNET_BIO_write_string(wh, uris)) ||
      (GNUNET_OK != GNUNET_BIO_write_meta_data(wh, dc->meta)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, dc->emsg)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, dc->filename)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, dc->temp_filename)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, dc->old_file_size)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, dc->offset)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, dc->length)) ||
      (GNUNET_OK != GNUNET_BIO_write_int64(wh, dc->completed)) ||
      (GNUNET_OK != write_start_time(wh, dc->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, dc->anonymity)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, (uint32_t)dc->options)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, (uint32_t)dc->has_finished)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (NULL == dc->emsg)
    {
      GNUNET_assert(dc->top_request != NULL);
      if (GNUNET_YES != write_download_request(wh, dc->top_request))
        {
          GNUNET_break(0);
          goto cleanup;
        }
    }
  GNUNET_free_non_null(uris);
  uris = NULL;
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  GNUNET_free(fn);
  return;
cleanup:
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  GNUNET_free_non_null(uris);
  if (0 != unlink(fn))
    GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", fn);
  GNUNET_free(fn);
  GNUNET_free(dc->serialization);
  dc->serialization = NULL;
}


void
GNUNET_FS_search_result_sync_(struct GNUNET_FS_SearchResult *sr)
{
  struct GNUNET_BIO_WriteHandle *wh;
  char *uris;

  if (NULL == sr->sc)
    return;
  uris = NULL;
  if (NULL == sr->serialization)
    sr->serialization =
      make_serialization_file_name_in_dir(sr->h,
                                          (sr->sc->psearch_result == NULL)
                                          ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                                          : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                                          sr->sc->serialization);
  if (NULL == sr->serialization)
    return;
  wh = get_write_handle_in_dir(sr->h,
                               (sr->sc->psearch_result == NULL)
                               ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                               : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                               sr->sc->serialization,
                               sr->serialization);
  if (NULL == wh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  uris = GNUNET_FS_uri_to_string(sr->uri);
  if ((GNUNET_OK != GNUNET_BIO_write_string(wh, uris)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh,
                                            sr->download != NULL
                                            ? sr->download->serialization
                                            : NULL)) ||
      (GNUNET_OK !=
       GNUNET_BIO_write_string(wh,
                               sr->update_search != NULL
                               ? sr->update_search->serialization
                               : NULL)) ||
      (GNUNET_OK != GNUNET_BIO_write_meta_data(wh, sr->meta)) ||
      (GNUNET_OK !=
       GNUNET_BIO_write(wh, &sr->key, sizeof(struct GNUNET_HashCode))) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, sr->mandatory_missing)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, sr->optional_support)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, sr->availability_success)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, sr->availability_trials)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if ((NULL != sr->uri) && (GNUNET_FS_URI_KSK == sr->sc->uri->type) &&
      (GNUNET_OK !=
       GNUNET_BIO_write(wh,
                        sr->keyword_bitmap,
                        (sr->sc->uri->data.ksk.keywordCount + 7) / 8)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  GNUNET_free_non_null(uris);
  return;
cleanup:
  GNUNET_free_non_null(uris);
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  remove_sync_file_in_dir(sr->h,
                          (NULL == sr->sc->psearch_result)
                          ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                          : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                          sr->sc->serialization,
                          sr->serialization);
  GNUNET_free(sr->serialization);
  sr->serialization = NULL;
}


void
GNUNET_FS_search_sync_(struct GNUNET_FS_SearchContext *sc)
{
  struct GNUNET_BIO_WriteHandle *wh;
  char *uris;
  char in_pause;
  const char *category;

  category = (NULL == sc->psearch_result) ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
             : GNUNET_FS_SYNC_PATH_CHILD_SEARCH;
  if (NULL == sc->serialization)
    sc->serialization = make_serialization_file_name(sc->h, category);
  if (NULL == sc->serialization)
    return;
  uris = NULL;
  wh = get_write_handle(sc->h, category, sc->serialization);
  if (NULL == wh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  GNUNET_assert((GNUNET_YES == GNUNET_FS_uri_test_ksk(sc->uri)) ||
                (GNUNET_YES == GNUNET_FS_uri_test_sks(sc->uri)));
  uris = GNUNET_FS_uri_to_string(sc->uri);
  in_pause = (sc->task != NULL) ? 'r' : '\0';
  if ((GNUNET_OK != GNUNET_BIO_write_string(wh, uris)) ||
      (GNUNET_OK != write_start_time(wh, sc->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_write_string(wh, sc->emsg)) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, (uint32_t)sc->options)) ||
      (GNUNET_OK != GNUNET_BIO_write(wh, &in_pause, sizeof(in_pause))) ||
      (GNUNET_OK != GNUNET_BIO_write_int32(wh, sc->anonymity)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  GNUNET_free(uris);
  uris = NULL;
  if (GNUNET_OK != GNUNET_BIO_write_close(wh))
    {
      wh = NULL;
      GNUNET_break(0);
      goto cleanup;
    }
  return;
cleanup:
  if (NULL != wh)
    (void)GNUNET_BIO_write_close(wh);
  GNUNET_free_non_null(uris);
  GNUNET_FS_remove_sync_file_(sc->h, category, sc->serialization);
  GNUNET_free(sc->serialization);
  sc->serialization = NULL;
}


static int
deserialize_unindex_file(void *cls, const char *filename)
{
  struct GNUNET_FS_Handle *h = cls;
  struct GNUNET_BIO_ReadHandle *rh;
  struct GNUNET_FS_UnindexContext *uc;
  struct GNUNET_FS_ProgressInfo pi;
  char *emsg;
  char *uris;
  uint32_t state;

  uc = GNUNET_new(struct GNUNET_FS_UnindexContext);
  uc->h = h;
  uc->serialization = get_serialization_short_name(filename);
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      GNUNET_break(0);
      goto cleanup;
    }
  uris = NULL;
  if ((GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "unindex-fn", &uc->filename, 10 * 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &uc->file_size)) ||
      (GNUNET_OK != read_start_time(rh, &uc->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &state)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read(rh, "uri", &uc->chk, sizeof(struct ContentHashKey))) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "unindex-kskuri", &uris, 10 * 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &uc->ksk_offset)))
    {
      GNUNET_free_non_null(uris);
      GNUNET_break(0);
      goto cleanup;
    }
  if (NULL != uris)
    {
      uc->ksk_uri = GNUNET_FS_uri_parse(uris, &emsg);
      GNUNET_free(uris);
      if (NULL == uc->ksk_uri)
        {
          GNUNET_break(0);
          GNUNET_free_non_null(emsg);
          goto cleanup;
        }
    }
  if ((uc->ksk_offset > 0) &&
      ((NULL == uc->ksk_uri) ||
       (uc->ksk_offset > uc->ksk_uri->data.ksk.keywordCount)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  uc->state = (enum UnindexState)state;
  switch (state)
    {
    case UNINDEX_STATE_HASHING:
      break;

    case UNINDEX_STATE_FS_NOTIFY:
      if (GNUNET_OK != GNUNET_BIO_read(rh,
                                       "unindex-hash",
                                       &uc->file_id,
                                       sizeof(struct GNUNET_HashCode)))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      break;

    case UNINDEX_STATE_DS_REMOVE:
    case UNINDEX_STATE_EXTRACT_KEYWORDS:
    case UNINDEX_STATE_DS_REMOVE_KBLOCKS:
      break;

    case UNINDEX_STATE_COMPLETE:
      break;

    case UNINDEX_STATE_ERROR:
      if (GNUNET_OK !=
          GNUNET_BIO_read_string(rh, "unindex-emsg", &uc->emsg, 10 * 1024))
        {
          GNUNET_break(0);
          goto cleanup;
        }
      break;

    default:
      GNUNET_break(0);
      goto cleanup;
    }
  uc->top = GNUNET_FS_make_top(h, &GNUNET_FS_unindex_signal_suspend_, uc);
  pi.status = GNUNET_FS_STATUS_UNINDEX_RESUME;
  pi.value.unindex.specifics.resume.message = uc->emsg;
  GNUNET_FS_unindex_make_status_(&pi,
                                 uc,
                                 (uc->state == UNINDEX_STATE_COMPLETE)
                                 ? uc->file_size
                                 : 0);
  switch (uc->state)
    {
    case UNINDEX_STATE_HASHING:
      uc->fhc = GNUNET_CRYPTO_hash_file(GNUNET_SCHEDULER_PRIORITY_IDLE,
                                        uc->filename,
                                        HASHING_BLOCKSIZE,
                                        &GNUNET_FS_unindex_process_hash_,
                                        uc);
      break;

    case UNINDEX_STATE_FS_NOTIFY:
      uc->state = UNINDEX_STATE_HASHING;
      GNUNET_FS_unindex_process_hash_(uc, &uc->file_id);
      break;

    case UNINDEX_STATE_DS_REMOVE:
      GNUNET_FS_unindex_do_remove_(uc);
      break;

    case UNINDEX_STATE_EXTRACT_KEYWORDS:
      GNUNET_FS_unindex_do_extract_keywords_(uc);
      break;

    case UNINDEX_STATE_DS_REMOVE_KBLOCKS:
      GNUNET_FS_unindex_do_remove_kblocks_(uc);
      break;

    case UNINDEX_STATE_COMPLETE:
    case UNINDEX_STATE_ERROR:
      /* no need to resume any operation, we were done */
      break;

    default:
      break;
    }
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming unindexing operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  return GNUNET_OK;
cleanup:
  GNUNET_free_non_null(uc->filename);
  if ((NULL != rh) && (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg)))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failed to resume unindexing operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  if (NULL != uc->serialization)
    GNUNET_FS_remove_sync_file_(h,
                                GNUNET_FS_SYNC_PATH_MASTER_UNINDEX,
                                uc->serialization);
  GNUNET_free_non_null(uc->serialization);
  GNUNET_free(uc);
  return GNUNET_OK;
}


static void
deserialize_download(struct GNUNET_FS_Handle *h,
                     struct GNUNET_BIO_ReadHandle *rh,
                     struct GNUNET_FS_DownloadContext *parent,
                     struct GNUNET_FS_SearchResult *search,
                     const char *serialization);


static struct GNUNET_FS_SearchContext *
deserialize_search(struct GNUNET_FS_Handle *h,
                   struct GNUNET_BIO_ReadHandle *rh,
                   struct GNUNET_FS_SearchResult *psearch_result,
                   const char *serialization);


static int
deserialize_search_result(void *cls, const char *filename)
{
  struct GNUNET_FS_SearchContext *sc = cls;
  char *ser;
  char *uris;
  char *emsg;
  char *download;
  char *update_srch;
  struct GNUNET_BIO_ReadHandle *rh;
  struct GNUNET_BIO_ReadHandle *drh;
  struct GNUNET_FS_SearchResult *sr;

  ser = get_serialization_short_name(filename);
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      if (NULL != ser)
        {
          remove_sync_file_in_dir(sc->h,
                                  (NULL == sc->psearch_result)
                                  ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                                  : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                                  sc->serialization,
                                  ser);
          GNUNET_free(ser);
        }
      return GNUNET_OK;
    }
  emsg = NULL;
  uris = NULL;
  download = NULL;
  update_srch = NULL;
  sr = GNUNET_new(struct GNUNET_FS_SearchResult);
  sr->h = sc->h;
  sr->sc = sc;
  sr->serialization = ser;
  if ((GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "result-uri", &uris, 10 * 1024)) ||
      (NULL == (sr->uri = GNUNET_FS_uri_parse(uris, &emsg))) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "download-lnk", &download, 16)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "search-lnk", &update_srch, 16)) ||
      (GNUNET_OK != GNUNET_BIO_read_meta_data(rh, "result-meta", &sr->meta)) ||
      (GNUNET_OK != GNUNET_BIO_read(rh,
                                    "result-key",
                                    &sr->key,
                                    sizeof(struct GNUNET_HashCode))) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &sr->mandatory_missing)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &sr->optional_support)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &sr->availability_success)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &sr->availability_trials)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  if (GNUNET_FS_URI_KSK == sr->sc->uri->type)
    {
      sr->keyword_bitmap = GNUNET_malloc(
        (sr->sc->uri->data.ksk.keywordCount + 7) / 8); /* round up, count bits */
      if (GNUNET_OK !=
          GNUNET_BIO_read(rh,
                          "keyword-bitmap",
                          sr->keyword_bitmap,
                          (sr->sc->uri->data.ksk.keywordCount + 7) / 8))
        {
          GNUNET_break(0);
          goto cleanup;
        }
    }
  GNUNET_free(uris);
  if (NULL != download)
    {
      drh = get_read_handle(sc->h, GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD, download);
      if (NULL != drh)
        {
          deserialize_download(sc->h, drh, NULL, sr, download);
          if (GNUNET_OK != GNUNET_BIO_read_close(drh, &emsg))
            {
              GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                         _("Failed to resume sub-download `%s': %s\n"),
                         download,
                         emsg);
              GNUNET_free(emsg);
            }
        }
      GNUNET_free(download);
    }
  if (NULL != update_srch)
    {
      drh =
        get_read_handle(sc->h, GNUNET_FS_SYNC_PATH_CHILD_SEARCH, update_srch);
      if (NULL != drh)
        {
          deserialize_search(sc->h, drh, sr, update_srch);
          if (GNUNET_OK != GNUNET_BIO_read_close(drh, &emsg))
            {
              GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                         _("Failed to resume sub-search `%s': %s\n"),
                         update_srch,
                         emsg);
              GNUNET_free(emsg);
            }
        }
      GNUNET_free(update_srch);
    }
  GNUNET_break(GNUNET_YES == GNUNET_CONTAINER_multihashmap_put(
                 sc->master_result_map,
                 &sr->key,
                 sr,
                 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming search operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  return GNUNET_OK;
cleanup:
  GNUNET_free_non_null(download);
  GNUNET_free_non_null(emsg);
  GNUNET_free_non_null(uris);
  GNUNET_free_non_null(update_srch);
  if (NULL != sr->uri)
    GNUNET_FS_uri_destroy(sr->uri);
  if (NULL != sr->meta)
    GNUNET_CONTAINER_meta_data_destroy(sr->meta);
  GNUNET_free(sr->serialization);
  GNUNET_free(sr);
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming search operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  return GNUNET_OK;
}


static void
signal_download_resume(struct GNUNET_FS_DownloadContext *dc)
{
  struct GNUNET_FS_DownloadContext *dcc;
  struct GNUNET_FS_ProgressInfo pi;

  pi.status = GNUNET_FS_STATUS_DOWNLOAD_RESUME;
  pi.value.download.specifics.resume.meta = dc->meta;
  pi.value.download.specifics.resume.message = dc->emsg;
  GNUNET_FS_download_make_status_(&pi, dc);
  dcc = dc->child_head;
  while (NULL != dcc)
    {
      signal_download_resume(dcc);
      dcc = dcc->next;
    }
}


static void
signal_search_resume(struct GNUNET_FS_SearchContext *sc);


static int
signal_result_resume(void *cls, const struct GNUNET_HashCode *key, void *value)
{
  struct GNUNET_FS_SearchContext *sc = cls;
  struct GNUNET_FS_ProgressInfo pi;
  struct GNUNET_FS_SearchResult *sr = value;

  if (0 == sr->mandatory_missing)
    {
      pi.status = GNUNET_FS_STATUS_SEARCH_RESUME_RESULT;
      pi.value.search.specifics.resume_result.meta = sr->meta;
      pi.value.search.specifics.resume_result.uri = sr->uri;
      pi.value.search.specifics.resume_result.result = sr;
      pi.value.search.specifics.resume_result.availability_rank =
        2 * sr->availability_success - sr->availability_trials;
      pi.value.search.specifics.resume_result.availability_certainty =
        sr->availability_trials;
      pi.value.search.specifics.resume_result.applicability_rank =
        sr->optional_support;
      sr->client_info = GNUNET_FS_search_make_status_(&pi, sc->h, sc);
    }
  if (NULL != sr->download)
    {
      signal_download_resume(sr->download);
    }
  else
    {
      GNUNET_FS_search_start_probe_(sr);
    }
  if (NULL != sr->update_search)
    signal_search_resume(sr->update_search);
  return GNUNET_YES;
}


static void
free_search_context(struct GNUNET_FS_SearchContext *sc);


static int
free_result(void *cls, const struct GNUNET_HashCode *key, void *value)
{
  struct GNUNET_FS_SearchResult *sr = value;

  if (NULL != sr->update_search)
    {
      free_search_context(sr->update_search);
      GNUNET_assert(NULL == sr->update_search);
    }
  GNUNET_CONTAINER_meta_data_destroy(sr->meta);
  GNUNET_FS_uri_destroy(sr->uri);
  GNUNET_free(sr);
  return GNUNET_YES;
}


static void
free_search_context(struct GNUNET_FS_SearchContext *sc)
{
  if (NULL != sc->serialization)
    {
      GNUNET_FS_remove_sync_file_(sc->h,
                                  (sc->psearch_result == NULL)
                                  ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                                  : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                                  sc->serialization);
      GNUNET_FS_remove_sync_dir_(sc->h,
                                 (sc->psearch_result == NULL)
                                 ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                                 : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                                 sc->serialization);
    }
  GNUNET_free_non_null(sc->serialization);
  GNUNET_free_non_null(sc->emsg);
  if (NULL != sc->uri)
    GNUNET_FS_uri_destroy(sc->uri);
  if (NULL != sc->master_result_map)
    {
      GNUNET_CONTAINER_multihashmap_iterate(sc->master_result_map,
                                            &free_result,
                                            sc);
      GNUNET_CONTAINER_multihashmap_destroy(sc->master_result_map);
    }
  GNUNET_free(sc);
}


static int
deserialize_subdownload(void *cls, const char *filename)
{
  struct GNUNET_FS_DownloadContext *parent = cls;
  char *ser;
  char *emsg;
  struct GNUNET_BIO_ReadHandle *rh;

  ser = get_serialization_short_name(filename);
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _(
                   "Failed to resume sub-download `%s': could not open file `%s'\n"),
                 ser,
                 filename);
      GNUNET_free(ser);
      return GNUNET_OK;
    }
  deserialize_download(parent->h, rh, parent, NULL, ser);
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failed to resume sub-download `%s': %s\n"),
                 ser,
                 emsg);
      GNUNET_free(emsg);
    }
  GNUNET_free(ser);
  return GNUNET_OK;
}


static void
free_download_context(struct GNUNET_FS_DownloadContext *dc)
{
  struct GNUNET_FS_DownloadContext *dcc;

  if (NULL != dc->meta)
    GNUNET_CONTAINER_meta_data_destroy(dc->meta);
  if (NULL != dc->uri)
    GNUNET_FS_uri_destroy(dc->uri);
  GNUNET_free_non_null(dc->temp_filename);
  GNUNET_free_non_null(dc->emsg);
  GNUNET_free_non_null(dc->filename);
  GNUNET_free_non_null(dc->serialization);
  while (NULL != (dcc = dc->child_head))
    {
      GNUNET_CONTAINER_DLL_remove(dc->child_head, dc->child_tail, dcc);
      free_download_context(dcc);
    }
  GNUNET_FS_free_download_request_(dc->top_request);
  if (NULL != dc->active)
    GNUNET_CONTAINER_multihashmap_destroy(dc->active);
  GNUNET_free(dc);
}


static void
deserialize_download(struct GNUNET_FS_Handle *h,
                     struct GNUNET_BIO_ReadHandle *rh,
                     struct GNUNET_FS_DownloadContext *parent,
                     struct GNUNET_FS_SearchResult *search,
                     const char *serialization)
{
  struct GNUNET_FS_DownloadContext *dc;
  char *emsg;
  char *uris;
  char *dn;
  uint32_t options;
  uint32_t status;

  uris = NULL;
  emsg = NULL;
  dc = GNUNET_new(struct GNUNET_FS_DownloadContext);
  dc->parent = parent;
  dc->h = h;
  dc->serialization = GNUNET_strdup(serialization);
  if ((GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "download-uri", &uris, 10 * 1024)) ||
      (NULL == (dc->uri = GNUNET_FS_uri_parse(uris, &emsg))) ||
      ((GNUNET_YES != GNUNET_FS_uri_test_chk(dc->uri)) &&
       (GNUNET_YES != GNUNET_FS_uri_test_loc(dc->uri))) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_meta_data(rh, "download-meta", &dc->meta)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "download-emsg", &dc->emsg, 10 * 1024)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "download-fn", &dc->filename, 10 * 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_string(rh,
                                           "download-tfn",
                                           &dc->temp_filename,
                                           10 * 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dc->old_file_size)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dc->offset)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dc->length)) ||
      (GNUNET_OK != GNUNET_BIO_read_int64(rh, &dc->completed)) ||
      (GNUNET_OK != read_start_time(rh, &dc->start_time)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &dc->anonymity)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &options)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &status)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  dc->options = (enum GNUNET_FS_DownloadOptions)options;
  dc->active =
    GNUNET_CONTAINER_multihashmap_create(1 + 2 * (dc->length / DBLOCK_SIZE),
                                         GNUNET_NO);
  dc->has_finished = (int)status;
  dc->treedepth =
    GNUNET_FS_compute_depth(GNUNET_FS_uri_chk_get_file_size(dc->uri));
  if (GNUNET_FS_uri_test_loc(dc->uri))
    GNUNET_assert(GNUNET_OK ==
                  GNUNET_FS_uri_loc_get_peer_identity(dc->uri, &dc->target));
  if (NULL == dc->emsg)
    {
      dc->top_request = read_download_request(rh);
      if (NULL == dc->top_request)
        {
          GNUNET_break(0);
          goto cleanup;
        }
    }
  dn = get_download_sync_filename(dc, dc->serialization, ".dir");
  if (NULL != dn)
    {
      if (GNUNET_YES == GNUNET_DISK_directory_test(dn, GNUNET_YES))
        GNUNET_DISK_directory_scan(dn, &deserialize_subdownload, dc);
      GNUNET_free(dn);
    }
  if (NULL != parent)
    {
      GNUNET_CONTAINER_DLL_insert(parent->child_head, parent->child_tail, dc);
    }
  if (NULL != search)
    {
      dc->search = search;
      search->download = dc;
    }
  if ((NULL == parent) && (NULL == search))
    {
      dc->top =
        GNUNET_FS_make_top(dc->h, &GNUNET_FS_download_signal_suspend_, dc);
      signal_download_resume(dc);
    }
  GNUNET_free(uris);
  GNUNET_assert(NULL == dc->job_queue);
  dc->task = GNUNET_SCHEDULER_add_now(&GNUNET_FS_download_start_task_, dc);
  return;
cleanup:
  GNUNET_free_non_null(uris);
  GNUNET_free_non_null(emsg);
  free_download_context(dc);
}


static void
signal_search_resume(struct GNUNET_FS_SearchContext *sc)
{
  struct GNUNET_FS_ProgressInfo pi;

  pi.status = GNUNET_FS_STATUS_SEARCH_RESUME;
  pi.value.search.specifics.resume.message = sc->emsg;
  pi.value.search.specifics.resume.is_paused =
    (NULL == sc->mq) ? GNUNET_YES : GNUNET_NO;
  sc->client_info = GNUNET_FS_search_make_status_(&pi, sc->h, sc);
  GNUNET_CONTAINER_multihashmap_iterate(sc->master_result_map,
                                        &signal_result_resume,
                                        sc);
}


static struct GNUNET_FS_SearchContext *
deserialize_search(struct GNUNET_FS_Handle *h,
                   struct GNUNET_BIO_ReadHandle *rh,
                   struct GNUNET_FS_SearchResult *psearch_result,
                   const char *serialization)
{
  struct GNUNET_FS_SearchContext *sc;
  char *emsg;
  char *uris;
  char *dn;
  uint32_t options;
  char in_pause;

  if ((NULL != psearch_result) && (NULL != psearch_result->update_search))
    {
      GNUNET_break(0);
      return NULL;
    }
  uris = NULL;
  emsg = NULL;
  sc = GNUNET_new(struct GNUNET_FS_SearchContext);
  if (NULL != psearch_result)
    {
      sc->psearch_result = psearch_result;
      psearch_result->update_search = sc;
    }
  sc->h = h;
  sc->serialization = GNUNET_strdup(serialization);
  if ((GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "search-uri", &uris, 10 * 1024)) ||
      (NULL == (sc->uri = GNUNET_FS_uri_parse(uris, &emsg))) ||
      ((GNUNET_YES != GNUNET_FS_uri_test_ksk(sc->uri)) &&
       (GNUNET_YES != GNUNET_FS_uri_test_sks(sc->uri))) ||
      (GNUNET_OK != read_start_time(rh, &sc->start_time)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read_string(rh, "search-emsg", &sc->emsg, 10 * 1024)) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &options)) ||
      (GNUNET_OK !=
       GNUNET_BIO_read(rh, "search-pause", &in_pause, sizeof(in_pause))) ||
      (GNUNET_OK != GNUNET_BIO_read_int32(rh, &sc->anonymity)))
    {
      GNUNET_break(0);
      goto cleanup;
    }
  sc->options = (enum GNUNET_FS_SearchOptions)options;
  sc->master_result_map = GNUNET_CONTAINER_multihashmap_create(16, GNUNET_NO);
  dn = get_serialization_file_name_in_dir(h,
                                          (NULL == sc->psearch_result)
                                          ? GNUNET_FS_SYNC_PATH_MASTER_SEARCH
                                          : GNUNET_FS_SYNC_PATH_CHILD_SEARCH,
                                          sc->serialization,
                                          "");
  if (NULL != dn)
    {
      if (GNUNET_YES == GNUNET_DISK_directory_test(dn, GNUNET_YES))
        GNUNET_DISK_directory_scan(dn, &deserialize_search_result, sc);
      GNUNET_free(dn);
    }
  if (('\0' == in_pause) &&
      (GNUNET_OK != GNUNET_FS_search_start_searching_(sc)))
    {
      GNUNET_log(
        GNUNET_ERROR_TYPE_WARNING,
        _("Could not resume running search, will resume as paused search\n"));
    }
  signal_search_resume(sc);
  GNUNET_free(uris);
  return sc;
cleanup:
  GNUNET_free_non_null(emsg);
  free_search_context(sc);
  GNUNET_free_non_null(uris);
  return NULL;
}


static int
deserialize_search_file(void *cls, const char *filename)
{
  struct GNUNET_FS_Handle *h = cls;
  char *ser;
  char *emsg;
  struct GNUNET_BIO_ReadHandle *rh;
  struct GNUNET_FS_SearchContext *sc;
  struct stat buf;

  if (0 != stat(filename, &buf))
    {
      GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "stat", filename);
      return GNUNET_OK;
    }
  if (S_ISDIR(buf.st_mode))
    return GNUNET_OK; /* skip directories */
  ser = get_serialization_short_name(filename);
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      if (NULL != ser)
        {
          GNUNET_FS_remove_sync_file_(h, GNUNET_FS_SYNC_PATH_MASTER_SEARCH, ser);
          GNUNET_free(ser);
        }
      return GNUNET_OK;
    }
  sc = deserialize_search(h, rh, NULL, ser);
  if (NULL != sc)
    sc->top = GNUNET_FS_make_top(h, &GNUNET_FS_search_signal_suspend_, sc);
  GNUNET_free(ser);
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming search operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  return GNUNET_OK;
}


static int
deserialize_download_file(void *cls, const char *filename)
{
  struct GNUNET_FS_Handle *h = cls;
  char *ser;
  char *emsg;
  struct GNUNET_BIO_ReadHandle *rh;

  ser = get_serialization_short_name(filename);
  rh = GNUNET_BIO_read_open(filename);
  if (NULL == rh)
    {
      if (0 != unlink(filename))
        GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", filename);
      GNUNET_free(ser);
      return GNUNET_OK;
    }
  deserialize_download(h, rh, NULL, NULL, ser);
  GNUNET_free(ser);
  if (GNUNET_OK != GNUNET_BIO_read_close(rh, &emsg))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failure while resuming download operation `%s': %s\n"),
                 filename,
                 emsg);
      GNUNET_free(emsg);
    }
  return GNUNET_OK;
}


static void
deserialization_master(const char *master_path,
                       GNUNET_FileNameCallback proc,
                       struct GNUNET_FS_Handle *h)
{
  char *dn;

  dn = get_serialization_file_name(h, master_path, "");
  if (NULL == dn)
    return;
  if (GNUNET_YES == GNUNET_DISK_directory_test(dn, GNUNET_YES))
    GNUNET_DISK_directory_scan(dn, proc, h);
  GNUNET_free(dn);
}


struct GNUNET_FS_Handle *
GNUNET_FS_start(const struct GNUNET_CONFIGURATION_Handle *cfg,
                const char *client_name,
                GNUNET_FS_ProgressCallback upcb,
                void *upcb_cls,
                enum GNUNET_FS_Flags flags,
                ...)
{
  struct GNUNET_FS_Handle *ret;
  enum GNUNET_FS_OPTIONS opt;
  va_list ap;

  ret = GNUNET_new(struct GNUNET_FS_Handle);
  ret->cfg = cfg;
  ret->client_name = GNUNET_strdup(client_name);
  ret->upcb = upcb;
  ret->upcb_cls = upcb_cls;
  ret->flags = flags;
  ret->max_parallel_downloads = DEFAULT_MAX_PARALLEL_DOWNLOADS;
  ret->max_parallel_requests = DEFAULT_MAX_PARALLEL_REQUESTS;
  ret->avg_block_latency =
    GNUNET_TIME_UNIT_MINUTES; /* conservative starting point */
  va_start(ap, flags);
  while (GNUNET_FS_OPTIONS_END !=
         (opt = GNUNET_VA_ARG_ENUM(ap, GNUNET_FS_OPTIONS)))
    {
      switch (opt)
        {
        case GNUNET_FS_OPTIONS_DOWNLOAD_PARALLELISM:
          ret->max_parallel_downloads = va_arg(ap, unsigned int);

          break;

        case GNUNET_FS_OPTIONS_REQUEST_PARALLELISM:
          ret->max_parallel_requests = va_arg(ap, unsigned int);

          break;

        default:
          GNUNET_break(0);
          GNUNET_free(ret->client_name);
          GNUNET_free(ret);
          va_end(ap);
          return NULL;
        }
    }
  va_end(ap);
  if (0 != (GNUNET_FS_FLAGS_PERSISTENCE & flags))
    {
      deserialization_master(GNUNET_FS_SYNC_PATH_MASTER_PUBLISH,
                             &deserialize_publish_file,
                             ret);
      deserialization_master(GNUNET_FS_SYNC_PATH_MASTER_SEARCH,
                             &deserialize_search_file,
                             ret);
      deserialization_master(GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
                             &deserialize_download_file,
                             ret);
      deserialization_master(GNUNET_FS_SYNC_PATH_MASTER_UNINDEX,
                             &deserialize_unindex_file,
                             ret);
    }
  return ret;
}


void
GNUNET_FS_stop(struct GNUNET_FS_Handle *h)
{
  while (NULL != h->top_head)
    h->top_head->ssf(h->top_head->ssf_cls);
  if (NULL != h->queue_job)
    GNUNET_SCHEDULER_cancel(h->queue_job);
  GNUNET_free(h->client_name);
  GNUNET_free(h);
}


/* end of fs_api.c */